Pets
This goes back to a rule governing territory dragons: A pet is a creature, any creature that you provide for and keep safe, or at least attempt to keep safe. Basically you feed it and give it shelter. That holds true in NewEarth as well. Some creatures are kept as pets and a person shouldn’t be expelled from a nest because of their pet, unless the pet endangers someone else visiting the nest. That was why Grabon could call Heron a pet and they could not be expelled from a nest or territory.